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McGuire Ballistics Feild Reports
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It's some of the easiest load development I've ever done.
KH_Outdoors
Well-Known Member
They have been very forgiving to work with in the 6 different rifles I've tried thus far from 6.5mm to .338 cal. Have not needed to do any seating depth testing at all. Only test for charge weight and occasionally I've tried multiple powders. Sometimes found it did better with one powder over another for best accuracy.
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For those wondering about load development and whether it's easy or difficult to find good loads. It's load tolerance. Check out the thread by @KH_Outdoors.
338-300 PRC... Sherman Improved!
As the title says, we are building out a 338-300 PRC and opted for the Sheman Improved version, the "33 Sherman Magnum". I've wanted to try one of the Sherman's for a while now and this one just makes sense! Seeking out to build a mid sized 338 cal rifle for hard use in Alaska, naturally the...
It's a long thread so here are some shortcut links to tge posts dealing with the copper rose development. BTW it was that load and bullet that was used on his sucessful AK brown bear hunt that is at the last few pages of that thread .
Intial testing
338-300 PRC... Sherman Improved!
Both are way more than we need for our hill country white tail... but ****, that 338 looks like a lot of fun for still having your pants on! If you are in the hill country, then you aren't too far from Nilgai territory and the .338 Sherman offerings flat out hammer those heavy-duty antelope.
Refinement of load (powder change)
338-300 PRC... Sherman Improved!
Most destructive bullet my guide saw on 85 grizz/ brownie kills. That is a good test. 😉 Especially torching out of that 338 RUM! I look forward to hearing more about that one. I got to thinking too, and it is worth mentioning. The 210 HHT at 3050-3080 fps with H4350 is actually a "softer"...
He ended up with a 0.5 moa load and he did only minimal development. His powder charges were in full 1 grain steps. When he found a good one he never even bothered trying smaller powder increments to fine tune. Same with bullet jump. Just took the first one and never tried refining it. So to me this was very similar to how your average handloading hunter would go about it. Stopping at good enough. With his components and quality of rifle build I would think the load could be further tuned to shoot in the 2s.
His load he went with off bipod 10x scope @ 8.5lb rifle 100 yd 3 shot.
It should be noted if you read the whole thread (which I think is a good reads it shows the full process from gun build load dev to final hunt and post hunt) that he tested out numerous bullets Accubond SMK Hammers etc but ended up going with the Copper Rose 225g 338 cal.
Anyways everything I have seen and so far with my 250s it's been easy. Actually easier than my badlands which were more sensitive to jump. Two of the easiest mono bullets IME to tune are hammers and these CR so far. I still have to try some other calibers. 6.5 125s are next. But that 168 7mm looks sweet. Makes me want to rush into a 7 Mega build to try it.
Here is the pics of the old brown bear he took. Not sure if it's already in this thread.
View attachment 599076
Attachments
KH_Outdoors
Well-Known Member
For those wondering about load development and whether it's easy or difficult to find good loads. It's load tolerance. Check out the thread by @KH_Outdoors.
338-300 PRC... Sherman Improved!
As the title says, we are building out a 338-300 PRC and opted for the Sheman Improved version, the "33 Sherman Magnum". I've wanted to try one of the Sherman's for a while now and this one just makes sense! Seeking out to build a mid sized 338 cal rifle for hard use in Alaska, naturally the...www.longrangehunting.com
It's a long thread so here are some shortcut links to tge posts dealing with the copper rose development. BTW it was that load and bullet that was used on his sucessful AK brown bear hunt that is at the last few pages of that thread .
Intial testing
338-300 PRC... Sherman Improved!
Both are way more than we need for our hill country white tail... but ****, that 338 looks like a lot of fun for still having your pants on! If you are in the hill country, then you aren't too far from Nilgai territory and the .338 Sherman offerings flat out hammer those heavy-duty antelope.
Refinement of load (powder change)
338-300 PRC... Sherman Improved!
Most destructive bullet my guide saw on 85 grizz/ brownie kills. That is a good test. 😉 Especially torching out of that 338 RUM! I look forward to hearing more about that one. I got to thinking too, and it is worth mentioning. The 210 HHT at 3050-3080 fps with H4350 is actually a "softer"...
He ended up with a 0.5 moa load and he did only minimal development. His powder charges were in full 1 grain steps. When he found a good one he never even bothered trying smaller powder increments to fine tune. Same with bullet jump. Just took the first one and never tried refining it. So to me this was very similar to how your average handloading hunter would go about it. Stopping at good enough. With his components and quality of rifle build I would think the load could be further tuned to shoot in the 2s.
His load he went with off bipod 10x scope @ 8.5lb rifle 100 yd 3 shot.
View attachment 599072
It should be noted if you read the whole thread (which I think is a good reads it shows the full process from gun build load dev to final hunt and post hunt) that he tested out numerous bullets Accubond SMK Hammers etc but ended up going with the Copper Rose 225g 338 cal.
Anyways everything I have seen and so far with my 250s it's been easy. Actually easier than my badlands which were more sensitive to jump. Two of the easiest mono bullets IME to tune are hammers and these CR so far. I still have to try some other calibers. 6.5 125s are next. But that 168 7mm looks sweet. Makes me want to rush into a 7 Mega build to try it.
Here is the pics of the old brown bear he took. Not sure if it's already in this thread.
View attachment 599073
View attachment 599076
Thanks for the mention! If anyone's ever curious about load development on the CR's feel free to shoot me a message. They've been easy in all my rifles so far. Haven't had to do anything special other than components swapping (occasionally try a different powder) and "coarse" adjustments.
KH_Outdoors
Well-Known Member
Here's another thread I started earlier this year for my 6.5 PRC and the 125 CRSF's. This same load has held up all year with practice and cool-hot conditions. I just loaded up my lot for the fall hunts 
Here's the link: https://www.longrangehunting.com/threads/mcguire-ballistics-6-5-prc-load-workup.353687/
Here's the link: https://www.longrangehunting.com/threads/mcguire-ballistics-6-5-prc-load-workup.353687/
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