Author Topic: triple 7 (Read 567 times)

Steve fuller · « **on:** January 20, 2005, 12:28:54 PM »

I ran out of Goex and am unable to find it locally so I thought I'd load some 2-f 777. These are the results: I am using NEW Winchester cases trimmed to 2.09 Fed 215 primer, .06 wad, RCBS 405 flat nose bullet weight at 425 gr.
Seated to the crimp groove, not crimped.
Load 1 - 63gr. by volume 48 gr. by weight , .250 compression. Shot about a 3" group at 100yds. A little hard to open the action.

Load 2 68 grains by volume , 52 grains by wt. .380 compression. shot about 5" at 100 noticbly more difficult to open action

Load 3 73 grs. by volume 57 gr. by weight compressed .555, this load was very hard to extract the brass and the case showed signs of what appeared to be head seperation ( bright ring just above rim) I only shot 2 of these before I noticed the ring so I quit shooting. When I got back I miked the cases fromn the last load and found that they had increased in length by .008 and were bulged at the base of the case by about .002.

I have shot 73 gr. of 3-f goex according to the SPG book without the extraction problems or case problems using remington brass. I thought that t-7 was to be used interchangable by volume compared to BP.

My question is this I bought the Win Brass 'cuz I heard that it was thinner and would allow more powder. Is it too thin or is the T-7 too much for this cartridge. I have to buy more brass but don't know if I should buy Win or not.
Thanks in advance Steve

Peddler Parsons · « **Reply #1 on:** January 20, 2005, 01:29:54 PM »

In my Sharps I use

50 grs. 777
CCI large rifle primers
405 gr bullets
Star Line brass

46 grs. 777
CCI large rifle primers
515 gr bullet
Winchester brass

Try cutting you powder down to decrees head pressure on the cases

The Platte County Kid · « **Reply #2 on:** January 20, 2005, 02:16:06 PM »

Are you using "FIRE FORMED CASES" or are you re-sizing the case each time?

The Platte County Kid

nortonguy · « **Reply #3 on:** January 20, 2005, 02:18:37 PM »

I was reading on some other sites that 777 doesn't like any compression. Just load with no air space. Also there was something about pressure increases that exceeded BP after a certain volume. It would be worth it to contact Hodgdon.

Steve fuller · « **Reply #4 on:** January 20, 2005, 02:37:37 PM »

Peddlar Parson is that by weight or volume? I just loaded some more with 45, 43, &41gr. by weight to try tomorrow.

Platte Co. Kid.... These were new cases trimmed to length not fireformed.
Although I do use fire formed cases. This seemed like alot of stretching for a new case.

Trapper-Jack · « **Reply #5 on:** January 21, 2005, 03:18:34 AM »

Steve
777 is not comparable to black powder on a volume to volume basis. It is a little hotter. Here is a link might be helpful, http://www.hodgdon.com/tripleseven/loadnote.php
They recomend a 15% reduction in powder when compared to the black and only about .10 inch compression.

quickdtoo · « **Reply #6 on:** January 21, 2005, 10:46:11 AM »

Hodgdon's T7 cartridge loads ....

http://www.hodgdon.com/data/muzzleloading/granular/t7cartridge.php

Ray Newman · « **Reply #7 on:** January 21, 2005, 11:52:24 AM »

I am unfamiliar w/ Triple 7 &, so I read the links contained in the previous 2 posts. I also observed that loading data was only for a cast lead bullet.

You had too much powder compression & over charged the rounds.

What rifle are you shooting?

Steve fuller · « **Reply #8 on:** January 21, 2005, 01:28:56 PM »

Thanks all for your reponses, I checked the web site and I had indeed overloaded, when I saw the ring I figured that at least that load was too hot. I have reloaded some carts. as per my previous post and 47 gr. by weight puts me right in line with Hodgdons 60 grs. by volume according to my measure, compression is .95. 45 grns by weight = no compression. Thanks again