Pressure/safety wise it makes no difference.
Long term, if you always do that, the throat erosion will be higher due to vortices caused by short brass. I trim only to half way to the trim length.
This.
Back in the early seventies when the 6.5x55 Swede rifles were appearing on the Canadian market, there had been some turmoil in manufacturing ammo in Canada. I don't remember all of the details but about the only brass for reloading available was either very expensive imported Norma or hard to find Dominion. US manufacturers were importing Norma for the sweet little M94 Carbines. The Ag42b rifles were just trickling into Canada along with a few M96 rifles. By 1980 International had thousands of them available in all grades from Good to fresh factory thorough repairs. They also sold surplus ammo, with corrosive priming under flake pistol powder, under wooden bullets.
I don't know what was in those primers but corrosive is putting it mildly.
I went to great lengths to get brass. I was lucky enough to come across a large batch of IVI 7.62x51 BLANK cases. These were easily cut down to appropriate length, neck resized and fireformed. Excellent brass. Still, a few hundred cases didn't go far as I had friends begging for them.
Finally enough was enough and I just necked down and fire formed 308 Win cases. Yes, the necks were very short but with the low pressures developed with the loads suggested for the M96 actions they were OK and surprisingly accurate.
I shot thousands of those rounds without incident.
On the flip side, when the Boers and British were slugging it out in South Africa they had an issue with short necks supposedly causing catastrophic failures. The Belgians were supplying the Boers with ammunition at some point in the conflict and there was a shortage of cash. They had a bunch of 7.65x53 cases on hand and weren't prepared to set up for 7x57 Mauser. They reformed the 7.65 cases to 7mm and sold them off to the Boers.
From what I can remember, the factory loads with the short necks were fine. The Boers, being thrifty folks, were asked to collect their brass, if possible, to return to depot and be reloaded. That's when the trouble began. They had catastrophic failures in the field with the reloaded cases.
TURF THE LIBERALS IN 2019
so i ball parked it but i understand and can see whats goin on here!!
