Thread: Subsonic project

I have a spare full container of AP70N if anyone needs some

Bugger wrong island would love that, Think I'll grab some APS450 (formally Ap50n), and go from there.

Originally Posted by mawzer308

Bugger wrong island would love that, Think I'll grab some APS450 (formally Ap50n), and go from there.

Careful, APS450 is not formally AP50n ,it is AS50n which is a good deal faster. If you can get AP50 it makes a very good subsonic powder in 44 Mag. AP70 and Unique would be my pick for 44 Mag however. I havent tried APS450 myself and would like to know your results. The faster the powder used with these relatively heavy projectiles can lead to dangerous spikes in pressure with just minor variations in powder or projectile weight and lube.

I've used 700x in 32/20 and 310 cadet with no issues same with red dot. Not that they are 44 cal but in my experience shotgun powders are pretty ideal for slow cast bullets whereas the pistol powders, like 2400 don't develop enough pressure to completly burn leaving residue in the barrel till you amp the speed up.

Originally Posted by Marty Henry

I've used 700x in 32/20 and 310 cadet with no issues same with red dot. Not that they are 44 cal but in my experience shotgun powders are pretty ideal for slow cast bullets whereas the pistol powders, like 2400 don't develop enough pressure to completly burn leaving residue in the barrel till you amp the speed up.

I'd be interested in your 32/20 loads if you care to share - PM me. thks

Biggest expense when shooting cast bullets especially if you roll your own is primers.
I never used to worry but as Ive started into my last 1000 I'd better start looking soon.

Originally Posted by Marty Henry

Biggest expense when shooting cast bullets especially if you roll your own is primers.
I never used to worry but as Ive started into my last 1000 I'd better start looking soon.

As soon as some turn up grab them people will turn American and start hoarding components this time round nothing will stay on the shelves long

Are you guys using magnum primers or standard?and what type of crimps?heavy,light?

They are loads I have developed myself over a few years.

700x is fine except it doesn't meter well in small charges. That is why I prefer the WST and WSF ball powder. I just realised that I am now using AR2205 for my 220 grain .300 Blackout subsonic loads (1060 fps) because of the better loading density (less air space).

@gundoc What are your thoughts on porting the barrel of a 44 or similar cal like the Delise carbine. I remember the JW 15's that you did with the ported barrels and full-length overbarrel suppressor (Gun City), great little accurate guns and very quiet

I am currently building one in .44 Magnum for my own use and will be using jacketed Hornady 300 grain XTP's which are fine with ported barrels. Lead bullets are not suitable for ported barrels unless the holes are quite small (1-1.5mm) and even then there could be shaving problems.

Originally Posted by gundoc

I am currently building one in .44 Magnum for my own use and will be using jacketed Hornady 300 grain XTP's which are fine with ported barrels. Lead bullets are not suitable for ported barrels unless the holes are quite small (1-1.5mm) and even then there could be shaving problems.

Two things, the lead bullets do go well in those ported norincos. Hornady 300 grain XTP - tried those, very accurate BUT crap on anything bigger than a hare. Dont get me wrong I have shot game with them but they are too hard. - Funny sort of brittle lead that wont mushroom, they are made for self protection from Bears. The Nosler 300 gr HP is vastly superior on game. With the XTP, it can go through a ram or even a Bisons skull and the animal appears ok. Nosler 'Thwack' skull cracked like a dropped easter egg

Thanks for that. I had read elsewhere that the Hornady's were a bit hard. I will see if I can find some Nosler's (probably on back-order!)

Rifle back suppressed witha DPT suppressor. Very short and handy, currently have a Bushnell trs-25 mounted but, may swap it out for my propoint or sig sauer, as the dot is alot bigger than the stated 3moa, and the lowest setting is still a bit bright for first and last light. Have all the components here so will load up a few tonight with some trailboss. Hopefully out hunting by the end of the week.