I have a reloading question

[Freezer]

I have decided to reload for my bolt action bullpup. I have an X-Caliber, 6 Arc,18 inch, 5R rifling, with a 7.5 twist barrel. I have had great success with Sierra Game King bullets and contacted them to find what the best bullet would be, its their #4100 6 90TGK. My problem is, though I can find load data for the this bullet in a bolt action the barrel they use is a 24 inch. I feel a faster powder is in order for the shorter barrel. Do any of you have experience with a shorter barreled 6 Arc or have a ballistic calculator to help find a load for this rifle/barrel combo?

[Ernie]

I have decided to reload for my bolt action bullpup. I have an X-Caliber, 6 Arc,18 inch, 5R rifling, with a 7.5 twist barrel. I have had great success with Sierra Game King bullets and contacted them to find what the best bullet would be, its their #4100 6 90TGK. My problem is, though I can find load data for the this bullet in a bolt action the barrel they use is a 24 inch. I feel a faster powder is in order for the shorter barrel. Do any of you have experience with a shorter barreled 6 Arc or have a ballistic calculator to help find a load for this rifle/barrel combo?

Use the same powders as you would for the 24" barrel.
The load manuals for almost all bottle neck cartridge will have a variety of powders to choose from, and some will burn faster and some will burn slower.
See what powders you have that match the 24" rifle data and go play

[CPJ 2.0]

At most you’re gonna lose 180-ish FPS from what the 24” load is doing. That gun, your ranges….meh. You’ll never know the difference.

[Freezer]

I used to be able to buy sample packs of powders , IIRC they were 4oz bottles. I don't shoot as much as I used to and don't want to spend $50 for a pound of powder I won't use. One powder that shows some promise that I have in stock is Varget...but. Just looking for someone with a little real world experience with this cartridge in a bolt gun.

[mitdr774]

No experience with 6ARC yet, but I have played with my 6.5 Grendel a bit. 2000MR, H4895, Varget, Benchmark, and IMR 3031 have been my usual choices. I am not sure how well those powders cross over with the 6ARC though.

[Jay]

We’ve seen pretty good velocity and accuracy in 6ARC using Leverevolution powder in bolt gun and AR loads. I load 75gr Vmax for coyotes and 106 ELD-X for pigs.

[JunkCollector]

I used to be able to buy sample packs of powders , IIRC they were 4oz bottles. I don't shoot as much as I used to and don't want to spend $50 for a pound of powder I won't use. One powder that shows some promise that I have in stock is Varget...but. Just looking for someone with a little real world experience with this cartridge in a bolt gun.

Ernie probably plays with that in a speciality pistol.
Go by what he recommended
He has the real world experience

[CPJ 2.0]

If you have Varget, try Varget. A bird in hand beats two in the bush. Do you have a chronograph?

[Freezer]

If you have Varget, try Varget. A bird in hand beats two in the bush. Do you have a chronograph?

A very old one! I haven't done a load work-up in years. I have my set recipes I worked up years ago, the last was with Varget for my 308. IMR 4350 works for my 280 and 6.5-06. I have IMR 4227 for my XP-100 but that's a no no for the Arc. I'm ordering a tapped case for my bullet comparator and have enough once fired brass to get a good test base. I will do this once and that's what this gun will shoot. When I have to spend $50+ on an experiment I will choose between the highest velocity and most accurate load data. When I work up the load it's accuracy first. Once I have a load chosen I put it through my Chrono and then my nephew's new one.

Oops I did a load work up with Varget for my wife's 6.5 CM. I started low and worked up. Max load shot best and that's where it sits.

[CPJ 2.0]

Throw some Varget in the case and see what happens.