.300WSM and 220 SMKs


April 3, 2010, 03:00 PM
Hey all,

I did a search looking for some loads, and didn't see any (even with Google). I hope my search-fu isn't failing me lol

Anyway, I have a Remington 700 SPS stainless... MAN I love that rifle. I have loaded everything from 150 grain .308 clones using Ramshot TAC to smoking 180s with RL17. One load I have been really looking for though is a 220 SMK at 2850 fps. I found one published load going 2750 using 64.5 grains of RL22 (Nosler reloading guide 6), but that's pretty much it. I don't mind working loads up but I really don't know how close that particular round is to max and if the accuracy will suffer from being driven that hard. Also, I am not too worried about the barrel since I plan to rebarrel it after next deployment anyway (thinking Shilen so far).

So, is it worth it developing this load, or am I just chasing the dragon here? Also, I have RL17, 19 and 22 on hand, would any of those be better than the other? I am thinking RL22 here, but if someone knows better than me, let 'er rip ;)

Thanks in advance

If you enjoyed reading about ".300WSM and 220 SMKs" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
April 3, 2010, 03:17 PM
The problem could be that working that bullet through the magazine will require seating so deep that it will really reduce powder capacity to be efficient.


April 3, 2010, 03:29 PM
The only reloading manual I have showing loads for the .300 Wizzem heavier then 200 grain is Hodgdon. They do show a 220 Horn Round Nose with a 2.830" OAL.
2.860" is max SAAMI OAL that will fit the magazine and chamber leade.

I agree with NCsmitty that the short case would require a 220 BT-HP like the Match King to be seated so deep it would almost be touching the primer pocket!!

Not saying it can't be done, just that I can't find any data for it either.


April 3, 2010, 03:32 PM
NCsmitty nailed it...the WSM's give up too much capacity for use with the truly "heavy for caliber" bullets.

April 3, 2010, 03:34 PM
I dont mind single loading them. I will have to see that the 220 SMKs seat at to the lands though then go from there.

ETA: Alrighty, 3" even COAL to the lands with the 220 SMK

April 3, 2010, 03:46 PM
for rcmodel; lots of 220 loads for the WSM on loaddata.com. It takes a subscription though which is still cheaper than buying every load manual out there.

April 3, 2010, 03:47 PM
I am a member of Loaddata.com, but BE SURE to double and triple check the info you get there.

Most of it is safe...but some of it is not.

April 3, 2010, 03:52 PM
oh yeah, always work up to max loads anyway, even the published ones.

April 3, 2010, 06:19 PM
What is your goal here? Small groups a 1000 Yards? If so think you might be better off going to a longer much heaver barrel (30") and using 200 - 210 grain match bullets in the 300 WSM. http://www.accurateshooter.com/forum/index.php/topic,2238517.0.html

April 3, 2010, 07:28 PM
well, honestly, I am just playing with it seeing if I can get that velocity and accuracy from my rifle. If I do get it, great! If not, cool, I tried. Besides, the SMK is only really good for target shooting. I really like my 180 CTST loads for hunting. There is a reason I am looking HARD at a .338 LM, so I am not trying to force the .300 WSM into a role it was never capable of.

April 3, 2010, 09:21 PM
If you don't mind loading singles, just off the lands, it makes it a new ball game. If the leade of the rifling allows you a sensible seat of the bullet, without encroaching too much on the powder space, it becomes a magnum again and takes advantage of the short, fat, target designed case capable of tossing a 190gr match bullet in excess of 3000fps.
Rel-17 is becoming more popular as people discover that it has amazing burn qualities and is pushing velocity levels even higher, while retaining normal pressure peaks and great accuracy. Especially in short mags and overbore style cases.
You might take a look at the Hornady 208gr A-Max for a heavyweight.

Here's a link to reloadersnest site with a few loads.



April 4, 2010, 12:20 AM
yeah, for tinkering like this, singles are just fine. I have been to reloaders nest and honestly, I dont like it much. With the exception of a few obvious loads from match shooters, the loads there concern me. At least the loads from loaddata.com are published loads. They may be aenemic, bit at least they arent casehead busters lol

Also, I was wrong about the seating depth for my rifle. 3 inch OAL is still jamming the 220 SMKs into the lands pretty hard. 2.925 OAL looks to be either just kissing or off the lands. I dont have a tool to measure this, so I have to go by how hard the bolt is to close and at that point, its the same as mag length loads. The mag length on the Remington 700 is 2.850, and thats snug.

I had gotten from 65 to 67 grains RL22 with 3.0 inch AOL with no presure signs before deciding I needed to realize my error and start over. This was also the same time I ran out of 220 SMKs LOL. Oh well, off to the store for another 100 Monday.

The wind was terrable today and the CED M2 was dancing all over the place giving a lot of errors. throwing out the errors, I got averages of the following using RL 22: 65 gr - 2708, 65.5 gr - 2716 and 66gr - 2721. Pretty small increases for .5 grain jumps. Most likely, this can be attributed to the dancing sensors, so I will try again Monday.

April 4, 2010, 03:27 AM
Here's what I came up with for 300 WSM 220 MK from my 23 inch Browning A-bolt.


That's a 100 yd group, hard to see but the av. velocity with 63.0 R-19 was 2686 with a high of 2700. I did this because most said it couldn't be done. I don't remember if they would fit in the magazine or not. Or what the OAL was. I didn't seem like they were at max pressure, or if they could be increased a bit.

April 5, 2010, 08:33 PM
Very nice Snuffy! BTW, I didnt get the bullets today, none of the stores in the area had em. Ended up with a new hockey skates and stick instead. Too many dang hobbies lol

September 25, 2010, 09:05 PM
Allrighty all, I finely got some time to go test some 220 grain loads seated to Remington 700 magazine depth (2.860"). Here are the results;

CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

Bullet: 220 grain SMK
Powder: Alliant Reloader 22
Brass: Winchester (virgin brass)
Primer: CCI large magnum rifle

CED Data Collector - 9/25/10
(f = flyers, (ED) = edited shots)
Total Strings = 7
Feet Per Second

String 1 64.5 Gain Baseline
1) 2623 3
2) 2630 10
3) 2607 -13

High: 2630
Low: 2607
E.S.: 23
Ave.: 2620
S.D.: 11.8
95%: 35.9

String 2 65 Gain 25 fps
1) 2642 -3.3
2) 2638 -7.3
3) 2656 10.7

High: 2656
Low: 2638
E.S.: 18
Ave.: 2645.3
S.D.: 9.5
95%: 28.9

String 3 65.5 Gain 19 fps
1) 2673 8.3
2) 2660 -4.7
3) 2661 -3.7

High: 2673
Low: 2660
E.S.: 13
Ave.: 2664.7
S.D.: 7.2
95%: 21.9

String 4 66 Gain 14 fps
1) 2687 8.7
2) 2698 19.7
3) 2650 -28.3

High: 2698
Low: 2650
E.S.: 48
Ave.: 2678.3
S.D.: 25.1
95%: 76.4

String 5 66.5 Gain 26 fps
1) 2677 -27.3
2) 2721 16.7
3) 2715 10.7

High: 2721
Low: 2677
E.S.: 44
Ave.: 2704.3
S.D.: 23.9
95%: 72.7

String 6 67 Gain 51 fps
1) 2743 -12
2) 2748 -7
3) 2774 19

High: 2774
Low: 2743
E.S.: 31
Ave.: 2755
S.D.: 16.6
95%: 50.5

String 7 67.5 Gain 36 fps
1) 2790 -1.7
2) 2795 3.3
3) 2790 -1.7

High: 2795
Low: 2790
E.S.: 5
Ave.: 2791.7
S.D.: 2.9
95%: 8.8

(End Of Data)

After 21 shots, my poor shoulder is pretty sore lol (ok, there is my whine for today). There was no flattened or cratered primers, no evidence of gas leakage around the primer and case expansion was all within acceptable limits. Looks like I can go higher, eh? I will try more next weekend, work permitting.

October 3, 2010, 12:38 PM
Before I begin to go further, can I get someone to post a Quickload on this? I would really appreciate it. The more I look at just how far I am going over, the more I wonder what my pressures are and the less I want to blow my face off. hehehehe

Also, I have been reading that apparently Alliant changed the recipe for RL-22 and people are actually getting 2 to 2.5 grains more than what QL shows. Still, it will let me know just how much of a fool I may be trying to be here, eh? lol

October 4, 2010, 07:52 AM
Just a quick question on your intentions. Is this for long range shooting or just cause you want to shoot the big 220s? If it is for long range shooting, there are better bullets. The trade off between weight and BC is not always linear. The 175 SMKs are a good ballance point as are some of the VLD bullets from Berger.

I must admit that I dont shoot a WSM but I ran these traps when building a long range load for my WM.

October 5, 2010, 11:13 AM
this is just a hobby, the 220s in a WSM are less than ideal. I just want to see how far I can get them safely. Yes, I know others have already done it, but then others have also built model airplanes and hotrods andboats and... well, you get my point ;). Oh, on the15th, assuming the mini-mall here on post can order one, I am getting the Stealth Recon Scout in .338 LM. That should take care of my long range wants hehehe Now, if I can just get my skills close to what the rifle is capable of, I will be happy.

October 5, 2010, 12:11 PM
While I have Zero experience with the .300WSM, I have quite a bit of experience with RL22 and heavy bullets in the .30-06. With the case capacity of your cartridge, RL22 is as good as it gets. You seem to have about 5 - 6 more grains of case capacity than I do. Have sent a lot of 190SMK's downrange (great LR bullet), and hope to try a few of the Hornady 208gr Amax's soon.


If you enjoyed reading about ".300WSM and 220 SMKs" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!