Improved 375 cheytac

[Coercionist]

I'm diving into a new project and need some advice from the experts here. I've been thinking about building up a rifle chambered for an improved 375 Cheytac. I've been researching for a while now, but I'm struggling to decide on the best reamer options for my specific needs.

I'm considering a few distinct options, but I'm not sure which would give me the most velocity, but I'm not sure how much of a difference it would make.

Additionally, I'm curious about the potential velocity differences across various reamers when paired with a 36-inch barrel. Has anyone had any experience with this and could share their findings? I understand the variables involved are numerous, but any ballpark figures or experiences you could share would be greatly appreciated.

Also, I plan on using different types of bullets for this project, including Cutting Edge solid bullets, and Badlands solids. I'm interested in how these different types of bullets might behave with the different reamer options, and again how velocity might be affected.

If anyone has any first-hand experience or could point me towards some resources that could help make this decision easier, I would greatly appreciate it. I'm also open to hearing about any other tips or considerations that I might not be thinking about right now.

Thank you in advance for your insights and advice. I look forward to reading your responses and learning from your collective experience.

 

[cummin_un_glued]

I'm diving into a new project and need some advice from the experts here. I've been thinking about building up a rifle chambered for an improved 375 Cheytac. I've been researching for a while now, but I'm struggling to decide on the best reamer options for my specific needs.

I'm considering a few distinct options, but I'm not sure which would give me the most velocity, but I'm not sure how much of a difference it would make.

Additionally, I'm curious about the potential velocity differences across various reamers when paired with a 36-inch barrel. Has anyone had any experience with this and could share their findings? I understand the variables involved are numerous, but any ballpark figures or experiences you could share would be greatly appreciated.

Also, I plan on using different types of bullets for this project, including Cutting Edge solid bullets, and Badlands solids. I'm interested in how these different types of bullets might behave with the different reamer options, and again how velocity might be affected.

If anyone has any first-hand experience or could point me towards some resources that could help make this decision easier, I would greatly appreciate it. I'm also open to hearing about any other tips or considerations that I might not be thinking about right now.

Thank you in advance for your insights and advice. I look forward to reading your responses and learning from your collective experience.

Sure,

I have an improved 375 cheytac. It gets 3170 with cutting edge 377gr MTAC bullets. Honestly though if i were doing it again i would just chamber a standard 375 cheytac and run the 400gr lazers. The additional capacity does not yield enough gain with the 400s.

 

[Coyote Shadow Tracker]

Just a knowledge question. Why make a 375IMP when all the power is already there?
We are building 338LMAIs and thinking back should have just stuck with the 338LM or get a bigger cartridge. No messing with fire forming everything is custom expensive Dies, Reamer
Thanks
Len & Jill

 

[sable tireur]

Using the 'improved' designs is not just about velocity in many situations. The improved shoulders; 30*, 32*, 35*, 37* and 40* will oftentimes promote better efficiency of burn or less powder waste. These improved shoulders can also increase the number of powders (greater selection) which burn efficiently when compared to the parent case. While this may not always be the result, it is more often than not.

Improving shoulders can be cyclical as well. There are periods of time when we believe that every cartridge case benefits from or will be enhanced by changing the shoulder angle. Then the idea goes into hibernation for a while until it rises up again.

As far as cost or custom accessories is concerned, a Ford Escort gets you to the places you need to go but some folks prefer a Porsche... I quit being concerned with die purchase quite a while ago, I make my own. With the ever increasing number of DIY folks in the firearms community, you'd think they would pursue this idea.

:)

 

[TXTrained]

Sure,

I have an improved 375 cheytac. It gets 3170 with cutting edge 377gr MTAC bullets. Honestly though if i were doing it again i would just chamber a standard 375 cheytac and run the 400gr lazers. The additional capacity does not yield enough gain with the 400s.

who made your Improved Dies? Would you be interested in selling the 375 Cheytac Improved CDies.Im considering building one.

 

[ELR Researcher]

Sure,

I have an improved 375 cheytac. It gets 3170 with cutting edge 377gr MTAC bullets. Honestly though if i were doing it again i would just chamber a standard 375 cheytac and run the 400gr lazers. The additional capacity does not yield enough gain with the 400s.

Data points, pls - chamber info (body taper is CIP min or reduced (blown out laterally); shoulder angle (CIP is approx 22 degrees, exclusive); neck-shoulder junction is CIP or moved forward - all resulting in what case capacity increase; jump increased, if so by how much; barrel length; velocity achieved with the 400s? Tks.

 

[41rem]

Kinda like my buddy Tom, he just had to have a .378 Ackley improved. I mean really? Just gotta have that extra 100 fps

 

[Fotis]

Sure,

I have an improved 375 cheytac. It gets 3170 with cutting edge 377gr MTAC bullets. Honestly though if i were doing it again i would just chamber a standard 375 cheytac and run the 400gr lazers. The additional capacity does not yield enough gain with the 400s.

Can you possibly share some of your loads or at least the powders you're using and overall length

 

[RH300UM]

Thank goodness some people want to " improve" and find what is possible.
Imagine the world without them?
Always "improve" when the opportunity presents itself

 

[snox801]

Using the 'improved' designs is not just about velocity in many situations. The improved shoulders; 30*, 32*, 35*, 37* and 40* will oftentimes promote better efficiency of burn or less powder waste. These improved shoulders can also increase the number of powders (greater selection) which burn efficiently when compared to the parent case. While this may not always be the result, it is more often than not.

Improving shoulders can be cyclical as well. There are periods of time when we believe that every cartridge case benefits from or will be enhanced by changing the shoulder angle. Then the idea goes into hibernation for a while until it rises up again.

As far as cost or custom accessories is concerned, a Ford Escort gets you to the places you need to go but some folks prefer a Porsche... I quit being concerned with die purchase quite a while ago, I make my own. With the ever increasing number of DIY folks in the firearms community, you'd think they would pursue this idea.

:)

I agree and people act like fireforming is an issue. How nobody I know does final load work till they have at least the first 100 rounds down the tube cause it's common knowledge that they speed up.

So you first 100 rounds could also be considered a waste of time unless just shooting for fun. After that I get better brass life and extra speed why not is the real question.

 

[snox801]

I have one from Kirby Allen. I'm very close to 3200fps with the ceb 400gr and that's not leaning hard. Kirby did the load work and it's a 32" barrel. Don't know anything about case design except he nailed it.

 

[Gregg C]

I have one from Kirby Allen. I'm very close to 3200fps with the ceb 400gr and that's not leaning hard. Kirby did the load work and it's a 32" barrel. Don't know anything about case design except he nailed it.

I'm on the same page. I'm running 410 Bergers at 3150. Lotta smack at distance.