30.06 Subsonics using N32C

[Daneren]

Hi there,

Do any of you know if it is even possible, to make a safe subsonic load for a 30.06 rifle using Vihtavuori N32C (Tin Star) powder?

- If it is possible, then i would love some load suggestions.



Thanks.

 

[bohem]

With or without a filler?

I'm not sure iwthout a filler but I've heard the stuff is basically trailboss and I've run trailboss subs with really heavy bullets in the 30-06.

12gr of powder and a 220SMK seated really deep into the case worked without a filler.

 

[Daneren]

I would prefer without filler (So as not to fill the suppressor, with all kinds of crap), but i don't know if it can be avoided.

If i use a filler (I have used cotton wool in black powder loads before), shouldn't i be able to use as low a charge as i want?

 

[bohem]

Yes, if you put a filler in there then you can go really low on the charge but like you already are aware, it has the tendency to leave stuff behind.

I did some more looking on Tin Star last night and everything I can find says you treat it like Trailboss for finding a load.

Try not to drop under 60% fill, 70% being optimal and with Trail Boss in a 30-06, that's around 15 grains under a 220SMK seated really deep.

 

[Daneren]

I'll give it a try, and let you know how it turns out.

Thanks for the help.

 

[former naval person]

Don't go so low that you stick a jacketed bullet in the middle of the barrel. Bad ju-ju.

 

[Daneren]

The goal is around 320 m/sec (~1050fps), that should be enough to avoid "plugs" and bad ju-ju.

 

[jumpmans]

I know the thread is quite old. nevertheless I can share some results for anybody seeking the information.
I am using 13,6grs of N32C, standard primer and 220 GRS Hornady RN3090 bullet. OAL 3,210". Barrel length 22", twist 1:10, v2 is around 310m/s

 

[GhostFace]

Do you think subs can be loaded with 208s/210s? I mean without the filler?

 

[st1650]

Do you think subs can be loaded with 208s/210s? I mean without the filler?

Depends of your barrel twist but with a 1:8 barrel you could use those 208/225 VLDs style bullets like the hornady 225 BTHP and because the round is so long it'll help with the fill rate.

Trail boss would be a much better, safer powder than Tinstar for that. I use tinstar for heavy 308 subs (240) but trailboss gives me a much better case fill on the 200-225gr which translate in lower SD/ES

For 30-06 subsonic 225 BTHP with Trail boss you could start at 13.0gr (75% fill) and work your way down to 11.5gr (67%)
with Tin star - 13 gr is 50% fill and 11.5 is 45% - starts to get pretty low for comfort - plus the ES will be shit, especially if you shoot upward or downward.

with 208 eld-m for example @ 3.30 coal - 13gr gives you 75% fill and 11.5 67%

One of my favorite subsonic 30 cal bullet is the Lapua 200 FMJ-BT and should stabilize in most 1:10 twist barrel but then again work down the load - make sure it doesn't keyhole and get a good chrony when working subsonic loads or that's a recipe for something bad to happen.

 

[GhostFace]

Thank you, I have a 1/10 barrel and I have always been tempted to try it but I must admit I’ve been somewhat hesitant to do it.