My 22-47 results.

[JustinP]

Hi Bob

2 questions:

1. What was the air temp when you were shooting? Would it have been cold enough to cause ammunition issues? In cold temps, use of standard small rifle primers can be problematic in a larger case. The fact these were BR4s may be indicative in this sense.

2. Have you checked primers are fully seated? If they aren’t, the risk is (again) inconsistent ignition as they are pushed forward when struck by the firing pin.

Just a couple of thoughts..

Justin

 

[JamesnTN]

My suggestion is try a tad slower powder. I’m not sure the case capacity of the 47 vs a 243 but in my 22-243 it shined well using RL22 with an 80 grain bullet at 3600-3650 fps

 

[boltfluter]

I would try seating the bullets .010 into the rifling. Works great on my rifles. Just a passing thought, good luck!

Paul

 

[bobinpa]

Hi Bob

2 questions:

1. What was the air temp when you were shooting? Would it have been cold enough to cause ammunition issues? In cold temps, use of standard small rifle primers can be problematic in a larger case. The fact these were BR4s may be indicative in this sense.

2. Have you checked primers are fully seated? If they aren’t, the risk is (again) inconsistent ignition as they are pushed forward when struck by the firing pin.

Just a couple of thoughts..

Justin

It wasn't very cold. Maybe 40° - 50°. The primers were definitely bottomed out. Thanks for the input.

 

[bobinpa]

My suggestion is try a tad slower powder. I’m not sure the case capacity of the 47 vs a 243 but in my 22-243 it shined well using RL22 with an 80 grain bullet at 3600-3650 fps

I'm not sure why but I didn't think of that. Maybe because it's a small case. I don't think I have any RL powders, so would you suggest H4831SC since I am currently using H4350?

 

[bobinpa]

I would try seating the bullets .010 into the rifling. Works great on my rifles. Just a passing thought, good luck!

Paul

This is what I'm going to do next. It's the easiest thing to try. Would you back the charge down or leave it and just change seating depth. I don't like to change more than one thing at a time or I won't know what the true affect will be from a change. Maybe I'll do both. Load some with the same charge and come down a tenth or 2. I'm going to take James' advice and try a different powder too.

 

[alf]

I'd put 'em 10-15 thou in the lands. I always start there, then there's only one way to go.

I tried H-4831-SC in mine, moly plated 80 VLD's 39 to 43 grains, 2989 to 3281 fps.

H-4350 out shot it.......

 

[bobinpa]

I'd put 'em 10-15 thou in the lands. I always start there, then there's only one way to go.

I tried H-4831-SC in mine, moly plated 80 VLD's 39 to 43 grains, 2989 to 3281 fps.

H-4350 out shot it.......

Thanks Alf. I'm going to try in the lands next, but I'm probably going to try H4831sc too just so I know. If 38.5 grains of H4350 was your max, where would you start with H4831sc? OR where would you expect your max to be with H4831sc?
Thanks again.

 

[alf]

I think you'll be fine starting at 39 grains. My notes didn't indicate any pressure at 43, but I stopped as the ES and groups were climbing. My 4831 is an old lot, and I feel a bit on the slow side, plus shooting moly, so I don't think you'll get there with 80's.

I never shoot w/o using a chrono, I'd feel like I'm flying blind......