You'll have to do a little right-angle trigonometry based on your known high point-of-impact at 50 yards. This will tell you how much higher your new front sight must be to bring down the P.O.I. to where it needs to be. Numrich offers an assortment. Order several different heights and return...
Five (5) pumps on a Benjamin (formerly Sheridan) are plenty for through-and-through shots on aluminum cans. Don't shoot innocent birds, however. It's wanton cruelty.
Are you familiar with Pyramid Air? In 2012 they sold me a Benjamin CR 397 valve repair kit for my beloved 1963 Sheridan Silver Streak 5mm multi-pump pneumatic rifle. The repair restored full original power. The kit's price was $28 and came with a numbered full schematic drawing of the rifle...
Do not pursue this line of thinking. I use liquid salt bath, immersing the case neck-to-shoulder for 5 seconds at 500°Centigrade. Then drop the entire case in ice water to stop the heat-treating.
Did you know that CCI Large Rifle Primers measure 0.126" in thickness, compared to 0.129" for both Federal and Winchester? This is why I've settled on CCI primers.
I use Al Cass FAST Valve, Slide & Key Oil. It's clear as water, odorless and light. Available via Internet, since there are few band instrument stores anymore.
Use HARDY™ 7mil thickness Nitrile Disposable Gloves. "Textured Finger Tips", "Powder Free", "Superior Protection". They're very tactile, yet tough. If you're careful not to tear them, each glove can be re-used many times. Just wash your gloved hands with soap and water, remove your gloves...
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