.264 Win Mag reloads with CCI BR2 Primers?

[JebWV]

I'm not new to reloading, but I am new to the .264 Win Mag.
I've just loaded up 20 some rounds for a powder ladder test using 120 gr Sierras over IMR4350.
However, I used CCI Br2 primers (I've used them for years with fine results in 300 WSM with similar powders) and after loading them I've started 2nd guessing myself.

Somewhere in the back of my mind, I seem to remember something about hang-fire risks with LR primers in a true magnum cartridge. Any of you use Br2's in magnums? IMR4350 is a middling to slow powder but it isn't the slowest and it's not spherical...hopefully, it isn't an issue, but I'd like any and all feedback. Thanks, Jim.

 

[mac86951]

I'm not new to reloading, but I am new to the .264 Win Mag.
I've just loaded up 20 some rounds for a powder ladder test using 120 gr Sierras over IMR4350.
However, I used CCI Br2 primers (I've used them for years with fine results in 300 WSM with similar powders) and after loading them I've started 2nd guessing myself.

Somewhere in the back of my mind, I seem to remember something about hang-fire risks with LR primers in a true magnum cartridge. Any of you use Br2's in magnums? IMR4350 is a middling to slow powder but it isn't the slowest and it's not spherical...hopefully, it isn't an issue, but I'd like any and all feedback. Thanks, Jim.

How many grains? I'd say for 20 rounds you'll be fine, maybe trouble in cold weather, but most likely not. I wouldn't worry unless there caribou hunting rounds for below 30degrees.

 

[JebWV]

I'm trying to work up a load for it. I've started with 57 grs and increasing by 0.5 grs up to 60.5 grs.

 

[watercam]

The BR2s will certainly light up 60+ grains (as in 30-06 w/ 180s). Try them and try Magnum primers next and compare results on paper.

 

[John Russell]

I'm not new to reloading, but I am new to the .264 Win Mag.
I've just loaded up 20 some rounds for a powder ladder test using 120 gr Sierras over IMR4350.
However, I used CCI Br2 primers (I've used them for years with fine results in 300 WSM with similar powders) and after loading them I've started 2nd guessing myself.

Somewhere in the back of my mind, I seem to remember something about hang-fire risks with LR primers in a true magnum cartridge. Any of you use Br2's in magnums? IMR4350 is a middling to slow powder but it isn't the slowest and it's not spherical...hopefully, it isn't an issue, but I'd like any and all feedback. Thanks, Jim.

I have a Remington Sendero-II in .264 Win Mag.

I shoot Win cases, BR-2 primers, and IMR-4350 powder with 95gr V-Maxs. Never any problem what-so-ever. I've been shooting this combination for over 7 years.

 

[JebWV]

Thanks for the replies. And no, if it is 30 below, I'm setting at home.

I posted the results from 100 yrds in the pictures below. The results aren't that great, but maybe one of you could help me make sense out of it.
I think it's either saying I should give up, rebarrel, or pick 60.5 grs of powder as the starting place to mess with the seating depth.
In my defense, the wind was 5 to 15 mph today lol

Anyway, any advice is appreciated.

Rifle: Winchester M70 Case: Winchester, Trimmed to 2.490"
Primer pockets uniformed, Flash holes deburred
Bullet: Sierra 120 gr sp #1720, seated 0.005" of lands (this rifle might have the shortest throat of any that I've seen)
Powder: IMR4350

 

[Bbear]

If I'm reading your graphs correctly, the second one showing group size with the ES shows that as you increased your powder you lowered all of the #'s and the groups improved. The 60.5 grain load would be where I'd stay. If your group is slightly above .5" and is repeatable, I'd call it good enough for a hunting load. If your looking for a target load you could tweak the seating depth and see what happens.

 

[Sitsntree]

I tried 4350 in my 264win but it just didn't like it I switched to retumbo and its now a hammer! Nosler brass CCI 250 and 120gr nosler balstic tip 70grs of retumbo kills white tail and coyotes with authority

 

[2506]

66.5 gr Retumbo with 130 Accubond WW case CCI 250 is the ticket in my 264 Win mag.

 

[JebWV]

I'm thinking that the results suggest that there is a node a little below 57 grs and around 60.5 grs. I'll load another batch at 60.5 and start dropping the seating depth by increments of 0.005". You all have me curious about Retumbo now. I'll have to pick some up to try out.