300 PRC

[Mike Tackleberry]

Ya I saw that.
The Sierras should be different. But I guess I can start 76

I've found H1000 to be a bit too fast for my liking with anything over 220s, Retumbo was a much better choice for me and my rifle! With H1000 I was having pressure signs around 2800 fps!

 

[HemiPowrd]

I've found H1000 to be a bit too fast for my liking with anything over 220s, Retumbo was a much better choice for me and my rifle! With H1000 I was having pressure signs around 2800 fps!

I'm currently using 230 gr ATips over 77.1 gr of H-1000. 30" barrel gives me 2900 FPS with no pressure signs at all. Just one data point tho.

 

[SloppyJ]

These are my first 30 shots through my build w/ 22" Proof. Only had BR2s on hand, no magnum primers. I'm going to retest some of the loads with magnum primers to see if there's any difference.

Staball HD 215 Berger
82gr - 2807.7
82.4 - 2776.1?
82.6 - 2794.7

Staball HD 200 ELD X
81.5gr - 2829.8
82 - 2884.6
82.5 - 2887.2
83 - 2864.1 ?
83.5 - 2917.9

Staball HD 180 Barnes TTSX
83gr - 2920.4
83.5 - 2895.8
84 - 3016.0
84.5 - 2992.5

H1000 180 Barnes TTSX
83.5gr - 3037.6
84 - 3102.3


H1000 Ladder 215 Berger
78gr - 2688.1
79 - 2716.4
79.5 - 2760.5
80 - 2791.0
80.2 - 2808.0
80.4 - 2780.1 ?
80.6 - 2805.0

Retumbo Ladder 215 Berger
79gr - 2716.2
79.3 - 2746.7
79.5 - 2759.7
80 - update prompt missed shot
80.3 - 2808.3

 

[Kickin45]

I'm currently using 230 gr ATips over 77.1 gr of H-1000. 30" barrel gives me 2900 FPS with no pressure signs at all. Just one data point tho.

Im running a 28” 1-8 SAC barrel. I’d like to be in the 2950 range. H1000 may not get me there. RE26 probably will, but it doesn’t exist lol I may have to try some Vihtavuori

 

[HemiPowrd]

Im running a 28” 1-8 SAC barrel. I’d like to be in the 2950 range. H1000 may not get me there. RE26 probably will, but it doesn’t exist lol I may have to try some Vihtavuori

I was a little surprised at the speed I ended up getting after barrel break in. I was hoping for 2850 so 2900 was nice to see. Not sure how long the barrel will last, but will replace it with a MOD BB Bartlein when it's done.

 

[Defender3]

I fell into a bunch of 250gr Atips and scooped them up before thinking I'm running a 1/9 in my 27" 300PRC vs the recommended 1/8.5. I'm on the east coast pretty much at sea level and was wondering if the 250s would still work, but just give up some BC?

 

[J Industries]

Here is my work up from Monday. I'm kicking myself for not loading 80.1gr. Would have been right at the pressure limit per GRT but might have been good SD too. This barrel only had 40 rounds on it when I started, so definitely some break in fluctuation to be expected along with large swings.

This was 6 rounds of each load. I attribute the abnormalities to new barrel. we will see as I surpass the 150-round mark.

 

[J Industries]

Re tested each side of the 79.8 and that might be the go to point for right now as the barrel breaks in. Moving pretty fast and I like it. 1 round in the 80.0 group has a little extra lift required, but nothing else looked or felt off.

Anyone have seating depth suggestions for the 225's? I'm currently at .020

 

[Kickin45]

Thanks J. Im starting a load build when I return from vacation.

I’m a 28” barrel with Sierra 230’s
Using your load data as a jumping off point.
Hoping for 2930-2950

 

[Rocketmandb]

I've found H1000 to be a bit too fast for my liking with anything over 220s, Retumbo was a much better choice for me and my rifle! With H1000 I was having pressure signs around 2800 fps!

I was using RL26 with 230s and getting great results at 2865 fps - RL26 is about the same burn rate as H1000. I also was using H1000 in my 37XC with Lehigh 353gr solids.

 

[J Industries]

Thanks J. Im starting a load build when I return from vacation.

I’m a 28” barrel with Sierra 230’s
Using your load data as a jumping off point.
Hoping for 2930-2950

I started off way down at 76 Grains for about 20 rounds or so to break in the barrel and determine velocity at a known powder weight. I then did all my work up with GRT and came up with the first ladder which brought me up to pressure limit per GRT. I noticed that final load was close to what I was looking for and decided to load each side of that to verify. I will be planning on shooting 79.8 for now and then probably reevaluate after 200 rounds.

The goal was this gun from the beginning was 225s at 3000 FPS. It is a 29 inch barrel.

 

[Kickin45]

I’m going to shoot 60-80 factory Hornady 225 ammo for a solid break in.
And was planning on starting at 75g. Maybe I’ll start at 76 now and jump in .3 increments
Thanks

 

[stoner69]

Anyone think a 1:8 twist is too fast for 208’s to 250’s?
What’s the downside of a fast twist in 300 PRC for ELR applications?

 

[Rocketmandb]

Anyone think a 1:8 twist is too fast for 208’s to 250’s?
What’s the downside of a fast twist in 300 PRC for ELR applications?

My current barrel is a 1:9 - 1:8 gain twist. It's working quite well.

 

[Kickin45]

My current is 1-8 and it loves 230’s

 

[stoner69]

My current is 1-8 and it loves 230’s

Either you or rocketman run the Berger 208 or the Hornady 208 in your 8 twists?

 

[Kickin45]

I do not. Built this to run heavies.
Berger twist calc says at sea level and 3k fps you’d be 2.36

I’m not sure when overstabilization begins