Ron Spomer Saved My Favorite Gun!

Published on April 13, 2024
Duration: 13:47

This video details how a deep cleaning process, inspired by Ron Spomer's advice, restored the accuracy of a Sako 90 Quest rifle. The rifle's accuracy degraded from sub-MOA to 2-inch groups, suspected to be due to fouling from lead/gilding metal bullets affecting all-copper bullet performance. After cleaning to bare metal using SC14 and a borescope, accuracy improved to an average of 0.64 inches.

Quick Summary

Ron Spomer's advice suggests that barrels previously fouled with lead or gilding metal bullets need a deep clean to bare metal for optimal accuracy with all-copper bullets. This process restored a Sako 90 Quest rifle's accuracy from 2-inch groups to an average of 0.64 inches.

Chapters

  1. 00:00Accuracy Issues with Sako 90 Quest
  2. 00:58Ron Spomer's Cleaning Theory Explained
  3. 01:52Baseline Accuracy Test Results
  4. 02:40Deep Cleaning Process with SC14
  5. 05:05Sightmark Presidio Scope Overview
  6. 06:06Post-Cleaning Accuracy Test Success
  7. 08:18Consultation with Ron Spomer on Fouling

Frequently Asked Questions

Why did the Sako 90 Quest rifle's accuracy suddenly decrease?

The rifle's accuracy dropped from sub-MOA to 2-inch groups. This was suspected to be due to fouling from previous use with lead/gilding metal bullets, which interfered with the performance of newer all-copper bullets.

What is Ron Spomer's theory on cleaning for copper bullet accuracy?

Ron Spomer advises that if a barrel has been previously shot with lead or gilding metal jacketed bullets, it must be cleaned down to bare metal to achieve good accuracy with all-copper bullets.

How was the Sako 90 Quest rifle's accuracy restored?

A deep cleaning process using SC14 Gun Cleaner and a borescope was performed to remove all copper and lead fouling, restoring the barrel to bare steel. This resulted in accuracy improving to an average group size of 0.64 inches.

What is the difference in accuracy before and after deep cleaning?

Before the deep cleaning, the rifle averaged 1.4-inch groups. After cleaning to bare metal, the average group size significantly improved to 0.64 inches, restoring its sub-MOA potential.

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