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One issue I'd like to get some feedback on is that the secondary regulator is creeping up in pressure as though maybe an "O" ring is leaking by. This started to happen after 2 jams in a row with .254 slugs where all air bled off. I moved back to .253 ZANs and they fit and shoot perfectly but now...

According to Greg K on YouTube, straight lead will leave deposits that will require much more frequent cleaning. As you probably know, the K1 and GK1 are not the easiest barrels to clean. He suggests some level of hardness to extend cleaning cycles. Have not tried straight lead but would like to...

I have not done a hardness test, simply added lead to make it a 3 to 1 mix, 1 hardball to 3 lead to reduce the hardness. Seems to work for this batch but need a more structured process to finalize more consistent results. The revision so far works both in the K1 and GK1 .25.

Update: I cast slugs using 25% RO's hardball and 75% lead. Tested today and seems to work well in both the K1 and GK1 .25 caliber. Hits very hard at 50 grains!!

Update: I recast slugs using 25% RO's hardball and 75% pure lead. Tested today and seems to work well in both the K1 and GK1 .25 caliber. Hits very hard at 50 grains!!

I purchased my K1 about 3 months ago new. In addition, I purchased the MP Mold .254"/6.35 with the .253"/6.42 sizing die. I used Roto Metals Hardball 92% lead, 2% tin and 6% antimony. After casting and then sizing, I tried to load the K1 magazine. The problem is I would have to force them in the...

I have everything set-up in the garage. Just waiting for a warmer day.

Has anyone done the B/C calculations on the performance of the slugs produced with the MP Mold 6,42 – 8 cavity mold Version 3? Apparently this mold was designed specifically for the Huben .25 K1.

I have the Huben .25 K1 that I plan to cast some slugs. I just ordered the MP Mold and sizing die set for the .254 size. Anyone have a recommendation for a good reasonable press for the die?

I just ordered the MP Mold and sizing die set for the .254 size. Anyone have a recommendation for a good reasonable press for the die?

I had one purchased about 6 weeks ago. Work beautifully for about a month. then it stopped working. Sent it back to optics planet and they sent me a new replacement. This one connects fine but does not seem to pickup anything. Reinstalled app with no changes. Have it set on MKII setting and...