I can’t say enough about this bullet and its performance, even at extreme distances for a suppressed subsonic load. We were able to retrieve the bullet, which performed exactly as advertised (I’ve attached a picture of the bullet). After hearing the impact of the bullet, the deer ran less than 50 yards before expiring. The second shot was on an 8 point at 183 yards. The first deer was a doe, which was shot at 100 yards. We were able to harvest two deer with it over the weekend. I thought this would be a good opportunity to use my suppressed. Could we stick a projectile in the bore with a light load of powder? Definitely.308 Mauser could be right that current powder has been improved to eliminate the problem but we should not take any chances."I had the opportunity to guide a whitetail hunt this past weekend with disabled children. The factors seem to be: case large for calibre, steep shoulder? and load over 10% less than max. So there you have it, pressure excursions with non case filling loads of a slow powder related by someone who was actually there and cleaned up the mess afterward. Incidentally Roger had the same problem with IMR 7828 and a little less with H 4831. Roger felt that the excess air space in the case was the problem and eliminated all loads with more than 1/4 inch or more air space between the powder and the base of the bullet. In his second article Roger works up to a max of 57 grains of IMR 4831 with the 105 grain projectile for 3,224 fps with no problems. Velocity was 2,800 feet per second, a pedestrian load for the. Roger found that he could minimize the problems by elevating the muzzle prior to firing, seating the bullet backwards or increasing the jump to the lands. This should have been a mild load but blew primers, case heads and extractors. Roger used 49 grains of IMR 4831 in fire formed cases with Speer 105 grain spitzer projectiles. Roger's first article dealt with his struggles with start loads. It was basically a 6 mm-06 Max with the shoulder moved forward and increased to 35 degrees. The 240 Gibbs was a wildcat from the 1950's developed by Rocky Gibbs. I will retrieve the issue from the banana box storage system and report any additional bits I find.Īrticles appeared in Handloader Magazine in 19 written by Roger Stowers about loading for the 240 Gibbs. There was an excellent article on SEE in Handloader Magazine some years back from memory in line with what shooternz has given above. They probable other theories, Until it happens in controlled condition no one knows, So don't load below recommend start loads and you can't go wrong, well you can but that is another story.Greetings All, Igniting it all at once, No two is that the primer fires and starts the projectile moving it stops when it hits the rifling and then the powder ignites and hits a pressure spike, One is that the powder lays flat on the bottom of the case while in the chamber below the flash hole when the primer fires the flash does the length of the powder The right weather conditions to trigger it, One thing every one agrees on that it is light charges of slow burning powder that causes it, there are two main theories So it must be rarer than getting struck by lightening, The labs maybe too well controlled Temperature and Humidity wise for it to happen it may need Photos pop up on websites once in a while of rifles having S.E.E Secondary Explosive Effect or detention, The labs have never managed to duplicate it
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