RMR 223 69gr. ?

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kmw1954

kmw1954

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Simple question with no right or wrong answer. Since the RMR 69gr bullet is not listed in any published data I am looking for a starting point for my seating depth and finally settled on 2.250 as that is what I was using on the Hornady 68gr Match even though the profiles are not similar and the Match is longer.

So I would just like to compare this to what the rest of you are starting at.
 
I found the profile is almost the same as the Hornady 55gr FMJBT on the front end, longer in back for the extra weight. Just started test some last week, more to come. With my guns using the 68 gr SMK I had to shorten my OAL by 0.030-0.040" to get it out of the lands with my min spec chambers.
 
Before I started I took a once fired case and lightly neck sized it to hold a bullet and then did a jam with the bullet and my model 10. Upon removing the test and measuring the overall length was 2.385" so to seat to 2.250" is a huge jump. Then also did the same with the Hornady 68gr and it was even longer at 2.406".

Here I was to believe after jam the general setback was to be about .020" as a start reference.
 
Seems like there is a lot more bullet set down into the case. If you are using load data for the 68gr Hornady I think I'd like to start about 15% smaller powder charge since the pressures will be higher due to the decreased case capacity. Check with the chrono and go from there.
Did RMR not provide you with any load data?
 
Klaatu Barada Nikto said:
Seems like there is a lot more bullet set down into the case. If you are using load data for the 68gr Hornady I think I'd like to start about 15% smaller powder charge since the pressures will be higher due to the decreased case capacity. Check with the chrono and go from there.
Did RMR not provide you with any load data?
Click to expand...

What does powder charge have to do with a starting seating length? Next I think you have it backwards. The Hornady bullet is longer therefore would be seated deeper than the shorter RMR if loaded to the same length so the pressure for the RMR would be reduced.

RMR Does not provide load data. Then if they do I have never seen it.
 
kmw1954 said:
What does powder charge have to do with a starting seating length? Next I think you have it backwards. The Hornady bullet is longer therefore would be seated deeper than the shorter RMR if loaded to the same length so the pressure for the RMR would be reduced.

RMR Does not provide load data. Then if they do I have never seen it.
Click to expand...
Thought I read that you mentioned the RMR round was longer. Sorry.
I ran across some bad info for 200g 45 Auto vs 230g, both plated round nose. Same COL and powder charge was very close.
Measured overall length on the proj and they varied by .065"
So somebody was messing with their data. Loaded the 200g per Hornady's advice and it almost became a squib.
Added .2 grn of Win 231 and shortened the COL until I got up to 815FPS.
 
Klaatu Barada Nikto said:
Thought I read that you mentioned the RMR round was longer. Sorry..
Click to expand...

Yes I have moments of dyslectic reading also.
Just trying to keep everything on topic. Load workup had already been established.

I could push this out to 2.260" but I guess there is really no point unless going shorter doesn't pan out.
 
Call them and ask. They have provided me information on their 9mm bullets and commented on.my load plan. I'm sure a few people here got some and would appreciate you passing along any data.
 
kmw1954 said:
Simple question with no right or wrong answer. Since the RMR 69gr bullet is not listed in any published data I am looking for a starting point for my seating depth and finally settled on 2.250 as that is what I was using on the Hornady 68gr Match even though the profiles are not similar and the Match is longer.

So I would just like to compare this to what the rest of you are starting at.
Click to expand...

Use the same load data that you would for a Hornady 68, or a Sierra 69. They are both close enough it doesnt matter.

Im running them at 2.255" COAL with a .078 jump. Load data is on the target.
cGdK55Q.jpg
 
AJC1 said:
I'm sure a few people here got some and would appreciate you passing along any data.
Click to expand...

Well I am more than certain a few people here have already used these which is why I posted the question so that those that do could share.

Now I do not know or guarantee that the length I started at is correct or way off base but it is what I started with. 2.250" OAL.

Loading these with Ramshot TAC and WSR primers I started at 21.4, 21.7 and 22.0gr of powder. Rifle was sighted to 100yds with a Hornady 68gr Match. Those were also loaded with Ramshot TAC @ 23.5gr.... The Lightly loaded 69gr RMR shot consistently 2" low and slightly left. So now I will bump up the charge and compare again. See it a little more powder brings them up.
 
kmw1954 said:
Well I am more than certain a few people here have already used these which is why I posted the question so that those that do could share.

Now I do not know or guarantee that the length I started at is correct or way off base but it is what I started with. 2.250" OAL.

Loading these with Ramshot TAC and WSR primers I started at 21.4, 21.7 and 22.0gr of powder. Rifle was sighted to 100yds with a Hornady 68gr Match. Those were also loaded with Ramshot TAC @ 23.5gr.... The Lightly loaded 69gr RMR shot consistently 2" low and slightly left. So now I will bump up the charge and compare again. See it a little more powder brings them up.
Click to expand...

I found the accuracy on them got better as I increased case fill with both 8208 XBR and CFE223. If youre not seeing pressure signs, I would increase the powder charge. The 24.3 load of 8208 I posted is above Hodgdon max which is 23.8
 
Kaldor said:
I found the accuracy on them got better as I increased case fill with both 8208 XBR and CFE223. If youre not seeing pressure signs, I would increase the powder charge. The 24.3 load of 8208 I posted is above Hodgdon max which is 23.8
Click to expand...

With the Hornady I had 6 each loaded @ 23.5, 23.7 and 23.9... Western lists TAC max at 23.7 and I did not see or feel any real pressure signs though the 23.9 load did open up greatly over the the other two that were about 3/4moa at 100yds while the 23.9 was over 1.5"..
 
kmw1954 said:
With the Hornady I had 6 each loaded @ 23.5, 23.7 and 23.9... Western lists TAC max at 23.7 and I did not see or feel any real pressure signs though the 23.9 load did open up greatly over the the other two that were about 3/4moa at 100yds while the 23.9 was over 1.5"..
Click to expand...
Its hard to say if you will find an accuracy node before you hit pressure signs with TAC being that you are opening up at just over max.
Western/Accurate is not afraid to put up load data that truly is max, so I certainly pay more attention to it than I do Hodgdons data which is always under max by a good bit.
 
Correction needed; Western lists 68gr Hornady Max load @ 24.4gr of TAC. Now I have no idea where I seen or came up with that 23.7. I had to question myself because I never load to max. So Sorry folks! The only data I have been using for this has been Western Powders and Hornady #10.

Still the 23.5 and 23.7 proved to be super loads in this gun which I find hilariously strange as the 23.6,23.7,23.8gr load with the Hornady 62gr bullet is also the most accurate load. Now I hope that holds true with this RMR 69gr bullet.

Also just finished loading 12ea. 23.0 and 23.3 and then 6 @ 23.6 as I ran out of prepped brass.
 
Be careful use the same load data for the Hornady 68gr and Sierra 69gr SMK. The Hornady bullet is 0.090" longer than the Sierra. So all that extra length gets stuffed into the case, decreasing volume and increasing powder. This is why if you look at Hornady data vs Sierra, Hornady is slightly more than a grain lower.

I had a neighbor use Sierra data with the Hornady and he was blowing primers.

So be careful. These 2 bullets are quite different in profile.
 
Yes sireee, one of the first things I did was compare the RMR to the Hornady and the Hornady is longer by around that much which again why I am asking for input from those that have used this bullet. So now today after looking at data again I am bewildered as to where or what I was looking at. as the load I thought I found had 21.0gr as a starting point. So I loaded 21.4, 21.7 and 22.0... Westerns start is 21.9 so I was well below that.
 
I’m using H335. Hodgon’s website has the Sierra bullet and lists a COL of 2.235. This is what I’m using in my AR as I can’t load much longer.

Starting load is 22 grains, max is 24. I loaded a ladder from 22 to 23.9. Will report back with results.
 
kmw1954 said:
Yes sireee, one of the first things I did was compare the RMR to the Hornady and the Hornady is longer by around that much which again why I am asking for input from those that have used this bullet. So now today after looking at data again I am bewildered as to where or what I was looking at. as the load I thought I found had 21.0gr as a starting point. So I loaded 21.4, 21.7 and 22.0... Westerns start is 21.9 so I was well below that.
Click to expand...

Your good, Your starting low and working up as you should. The max between the SMK and Hornady is a little over 1.4gr. So if you go by Hornady you will be good. But you may found that you may need to go higher to get what Hornady publishes for velocity. I keep going till I see pressure signs then I back off. If I don't find a node I change powders and try again. I shooting Min Spec Match Chambers in AR's so I give up a little but not much all 24" barrel.

The profile on the bullet looks like it will be ideal for those with the Wydle chamber.
 
We've always just used data for the SMK. Our bullet is closer to the SMK in shape and OAL so it won't matter at all. The most recent ones we are shipping float around .902" and have just a slightly better BC than the SMK. I just shot a bunch yesterday and managed to lay waste to a bunch of ground squirrels. It was glorious and also immensly satisfying to shoot my design and my dream bullet with such awesome results. The 69 grain RMR bullets took more than 6 years to finally get in full production, but I am so glad we are finally there. I LOVE that bullet. It is legit.
 
longdayjake said:
We've always just used data for the SMK. Our bullet is closer to the SMK in shape and OAL so it won't matter at all. The most recent ones we are shipping float around .902" and have just a slightly better BC than the SMK. I just shot a bunch yesterday and managed to lay waste to a bunch of ground squirrels. It was glorious and also immensly satisfying to shoot my design and my dream bullet with such awesome results. The 69 grain RMR bullets took more than 6 years to finally get in full production, but I am so glad we are finally there. I LOVE that bullet. It is legit.
Click to expand...
The boss has provided.....
 
I loaded up 60 of these and I wasn’t thrilled with the consistency in the OAL. I was using LC brass, trimmed to the same length on a single stage RCBS using the taper crimp small base RCBS dies. I was shooting for 2.235 and got anywhere from 2.224 - 2.248.

Is this acceptable? The standard deviation and variance of the 60 I loaded is higher than I’m used to on my 9mm loads (which are also RMR bullets and very, very consistent).

Am I doing something wrong? Better seating die available? I am going slow and smooth and RCBS cams over.
 
I guess it can depend on several factors. When you measure just the bullet themselves what kind of variance do you get? We are still getting used to making rifle bullets. They are very different from pistol bullets, but our results were good enough that we were really excited about them. I'm sure that we will get better at making them as we go, but try shooting them for accuracy and see what you get.
 
I know measuring from the ogive would be more accurate but I don’t have that tool. I’ll take a few measurements of the bullets and add that in this discussion.

looking forward to getting out to the range. Also looking forward to when things return to normal and I don’t have to wait months for bullets.

Jake - when are you going to drop another batch on the website??
 
longdayjake, thank you so very much for responding again! Someone else mentioned to me that this RMR 69gr bullet was closer to the Sierra than the Hornady. I now have 30 more of these loaded with three different and higher charges than the first batch and am anxious to try these,

Using just plain Jane Lee dies I was able to hold OAL to 2.248-2.251" on an old Lee 3 hole turret press... Again not sure if that is the optimum length but I had to start somewhere.

I also passed 25 of these along to a fellow RO and reloader to give a quick try.
 
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