Short 10 Bismuth load
 

Got this back form Tom Armburst if anyone is interested. Not as fast or as much pressure as I had hope for, but, Unigue is pretty predictable so I can easily increase the powder charge and get what I need . Should be a good load to work off of.

since I have not had any rounds tested to date-- please entertain a question

the second column- pressure --(assuming line 4 starts with a 7 not a 9- in which case the variance is more) it looks to have a low of 7100 and a high of 8800, a 1700 psi variance- although the sheet shows 1000

it seems erratic- what max were you looking for? and how do you know where it is headed from the different starting points when you bump the charge

Nothing wrong with that load as it is. Enough pressure to prevent squib loads, enough velocity to kill game and keep patterns tight. I would not be hesitant to shoot that in a composite barrel gun either. Thanks for sharing.

The psi for line 4 is 9100 . The difference between 9200 high and low 8200 = 1000 . (EV or ES ) Shotshells are a pretty sloppy system and those are good numbers ( while not the best I have ever gotten ) for a shotshell . I am very happy with the consistency of the load. Even an ev of 1700 would be acceptable , I have seen tested Factory loads that where not that good

For me max average would be 11000 psi , for my Ithaca NID . I was hoping for something above 9000 psi and around 1200 -1250 fps .

From my experience with Unique in the past an increase of 1 grain should give an increase in pressure of about 500-800 psi ave, and put where I want to be speed wise . the only real way to tell is have it retested .

Disclaimer : Everyone should always stick to tested data and should never increase ( or change ) any load without having it retested .

Thanks mark. Nice to see someone with a worse scrawl than mine. :)

Thanks Mark for providing this data. About to sit down and load a few this week. Can you tell me what the filler wad is in your chart? Rem SP10 + what?

Here is a bismuth load I had tested by Mr. Armburst. 6260psi EV 700psi, 1177fps 15fps EV.
I am not recommending this load but just posting the results for information.

I used a 16ga overshot card from BPI #OS16 . SP-16 + OS16 in the bottom of the shot cup . Any 16ga card .030-.040 will work. Depending on the exact length of your hull or shot size you use you may need more or none at all . I tried it without the osc first and my crimp was slightly dished , added the osc and it came out nice and flat .

Mark, little of topic but, do you have a target load for your 10 NID ? Reason I ask is loads I have been using in my Parker 10 Hammer Gun recoil a bit too much in my NID 10. It weighs pound and a half less than the Parker

Thinking 1 1/8 oz and either Green Dot or Unique, Remington hulls cut down to 2 7/8 SP 10 wad with a fiber filler fold crimped.

William

William , I don,t have any 1 1/8oz loads using Green dot or Unique . Green dot should work great for that purpose .


I use a 700x load off the spread sheets that Pete has compiled for us . It is low pressure but shoots just fine . I never shoot any target loads in cold enough weather to worry about it .