newbie question 270 reloading

[kchap1031]

I am reloading .270 winchester. New brass measured to spec. 2.534 When seating the bullet (hornady interlock sp 130gr) to hornady manual specs of 3.21 COL the bullet is not seated far enough for the case neck to reach the cannalure. When I achieve the seating depth where the bullet cannalure is in the right spot with the case neck for crimping my COL is around 2.995. Should I seat to the cannalure of try to stay with the hornady spec of 3.21 inches, which would not crimp the bullet in the cannalure? Any help appreciated. Not sure about minimum COL.

 

[ants]

Unless it's for a lever action rifle (or AR15) I generally ignore the cannelure.
I usually happen to buy non-cannelure bullets, so it's not a problem I face.

 

[FROGO207]

When using the different references they all will be close but different. That said I would use the Hornaday specs for loading that bullet. They have put the canalure at the spot that they want it and worked up a safe load to go with it. Using data for a Speer bullet with the groove in a different spot with dissimilar shape would not work as well or at all. They have spent lots of time with specific components to make a proper safe loadrange for you to use, so use the knowledge. Save your cash for more boolits. When you get more experience under your belt that's the time to deviate from the proven formulas to see if it can get better.
Yes as some do, the crimp is ignored but when starting out follow the recipe and get that correct before any fancy stuff. Always start 10% low and work to max (if needed).

 

[ants]

The point raised by our friendly OP is that the cannelure would seat the bullet deeper than the cartridge overall length listed in his published source. As a beginner, he's concerned about loading shorter. He doesn't want to deviate from the data, and that's smart.

 

[FROGO207]

I agree with you. But what data. The data from Hornaday on that bullet most always will be for the OAL using the canalure with their load from what I have seen. Generic data may give SAMMI OAL and that often will be different. Not everyone will or for that matter will not crimp the bullet, but the proper combo will assure the safe assembly of the round. Don't we always say to follow the recipe exactly and do not substitute components, and checkfor proper OAL (published for that combo)? Just trying to point him in the correct direction.

 

[JimKirk]

I ran into this same deal in a recent thread about 168 gr SMk in a 30/06. My older manual gave a COl of x.xx and a newer manual gave a different COl of x.xx. Turns out that my numbers were for the MAX SAMMI COL of the 30/06 and the other manual gave a loaded OAL for the 168 gr SMK. I thinks the terms should have been differentiated enough that there would not be as much confusion.

The crimp cannelure location was determinded by Hornady to be the best location for the normal use of that bullet, more than likely a 270 Winchester.

I would not crimp that bullet even though it has a crimp cannelure, it will help nothing.

Jimmy K

 

[jim147]

Ignore the cannelure groove. I would recheck your measurements. I don't know of any .270 loads under 3.100 but I don't have any of your bullets in the house.

I'll try to check tomorrow but IIRC I loaded that round right to the bottom edge of the cannelure.

jim

 

[James2]

I ignore the cannelure and seat the bullet to the length given in the recipe. I don't crimp 270 rounds. No need in a bolt action rifle. You didn't say what your rifle was.
Seating deeper may raise the pressures.
Does 3.21 work OK in the magazine?
3.21 is what I seat my bullets to for the 270 and it works well for me.

 

[retsub]

I have never used Hornady bullets, but...

I thought this "cannelure" you speak of isn't meant to be used as a cannelure, but as a means to lock the jacket to the core. Perhaps the position of the interlock ring is the best place for impeding expansion.

My dad used to load SSTs, which have an interlock ring, in 270WSM and he seated them as he would any other bullet in relation to the lands of the rifling.

 

[xmanpike]

Seating the bullet too deep could increase the pressure but only nominally. That would not be anything to be concerned about unless you are loading pistol, where there is much less room in the case.

The cannelure is nothing to be concerned over, I frequently load my .270 rounds to 3.330 and the cannelure in well out of the brass.

 

[kchap1031]

Thanks to all of you for your input. I am shooting these out of a .270 tikka t3 bolt action. When seated to the 3.21 they chamber fine and sit well in the clip. I actually shot a few rounds today and they did well. The cannelure was well above the case mouth. Only had one problem..flattened primers using 60 grains of Ramshot magnum and CCI 200 LR. Ramshot calls for 57.8 as the starting load so I will back down even more. They list max load at 64.2 but again, I am using Hornady and not Sierra or Barnes 130gr which is shown in the Ramshot data.