300 PRC and 199 Hammer Hunters

nwmnbowhunter

Well-Known Member
Joined
Nov 13, 2017
Messages
86
Got the new rifle out today. Figured it might help some guys out.

Work up your rifle carefully.

300 PRC - 26 in 1-9 twist bartlein barrel
199 HAMMER HUNTER
COAL - 3.630
CCI 250 primer
Hornady once fired brass bumped .002
RL 26 powder

75 gr - 3053 fps
76 - 3043
77 - 3093
78 - 3139
79 - 3192 faint ejector mark
80 - 3241 bright ejector and bolt slightly stiff

I loaded up 3 at 77.4 gr beforehand on another's suggestion. Since pressure was safe I shot 3 rounds.
3102 fps
3106
3089

Going to play some more in this area and stretch it out.
 

Mc Fraser

Well-Known Member
Joined
Jul 23, 2018
Messages
340
Location
Calgary, AB
I would load 3 rounds each in 0.3 increments from 76 to 78.5. Afterwards, I look after the lowest ES SD group. Also, keep a note about the velocity node. Then I move to seating depth tests.
 

ButterBean

Well-Known Member
LRH Team Member
Joined
Feb 5, 2012
Messages
2,976
Location
West Terre Haute Indiana
Got the new rifle out today. Figured it might help some guys out.

Work up your rifle carefully.

300 PRC - 26 in 1-9 twist bartlein barrel
199 HAMMER HUNTER
COAL - 3.630
CCI 250 primer
Hornady once fired brass bumped .002
RL 26 powder

75 gr - 3053 fps
76 - 3043
77 - 3093
78 - 3139
79 - 3192 faint ejector mark
80 - 3241 bright ejector and bolt slightly stiff

I loaded up 3 at 77.4 gr beforehand on another's suggestion. Since pressure was safe I shot 3 rounds.
3102 fps
3106
3089

Going to play some more in this area and stretch it out.
That's awesome
 

nwmnbowhunter

Well-Known Member
Joined
Nov 13, 2017
Messages
86
Further workup
3rd firing Hornady brass showed pressure early. Blew a primer at 78 grains RL 26.

I believe this has to do with the tight clearance at the datum line area.

5 shot groups
Es
76 - 32
76.5 - 10
77 - 21
77.4 - 33

At 425 yards both 76.5 and 77 were 0.58 and 0.51 moa.

Most likely will be riding the 3100 fps area.
 

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nwmnbowhunter

Well-Known Member
Joined
Nov 13, 2017
Messages
86
Got new ADG brass and loaded a few to find the speed node at 3100 fps.

COAL-3.630
ZERO degrees F

RL-26
74.5-3057
75- 3080
75.5-3090
76- 3103
76.5-3136

Target is 250 yards.
Last 3 shots is the tight group 75.5, 76, 76.5

Going to load some at 76 grains and see what it can do if the wind stays calm in the next couple days.

Ballistic-X-Export-2021-01-26 17:05:27.979900.png
 

ZReed85

Well-Known Member
Joined
Apr 5, 2016
Messages
685
Sub quarter minute is simply amazing with over 1 grain powder spread. Great shooting and reloading technique.... that LPR rifle doesn't disappoint either!
 

Russ66

Member
Joined
Oct 7, 2014
Messages
8
Location
NSW, Australia
Got new ADG brass and loaded a few to find the speed node at 3100 fps.

COAL-3.630
ZERO degrees F

RL-26
74.5-3057
75- 3080
75.5-3090
76- 3103
76.5-3136

Target is 250 yards.
Last 3 shots is the tight group 75.5, 76, 76.5

Going to load some at
I am in the planning stages of a 300 PRC build myself & would love to see more follow-up posts like this. I'll be building mine on an Ultimatum action so I can swap bolt heads/barrels out for various calibres. Hornady ELD-X & Nobler ABLR bullets are what I'm gravitating too (I'm in Australia & somewhat limited to bullet availability). Any input you have would be warmly welcomed.
 

Chaddrx

Active Member
Joined
May 1, 2020
Messages
27
Location
Idaho
I am in the process of building a 300 PRC and would like to shoot the 199g HH. I have RL-26 and H1K. I have looked on the Hammer Hunter forum but does anybody else have other load data for the 300PRC + 199HH?
 

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